HomeMy WebLinkAbout1994/07/26 Item 19
COUNCIL AGENDA STATEMENT
Item~
Meeting Date 7/26/94
ITEM TITLE: Public hearing to consider testimony on the establishment of Zone 8 in Open
Space District 20 for Rancho Del Rey Development for the perpetual
maintenance of a de silting basin
Resolution I? 58'ZtabliShing Zone 8 within Open Space District No.
20, confirming the report, ordering the improvements and levying the first
year assessments at $0 for Fiscal Year 1994/95
SUBMITTED BY: Director of Public Works ryJ
REVIEWED BY: City ManagerJ~ ~~ (4/5ths Vote: Yes_NoXl
A desilting basin was built by McMillin Development in City open space off-site of Rancho del Rey
land to trap silt which washed down from the upstream development. After maintenance by
McMillin for 5 years, the City will have to maintain the basin. Formation of Zone 8 within Open
Space District 20 will provide financing for this maintenance.
RECOMMENDATION: That Council conduct the second public hearing to consider testimony on
the establishment of Zone 8 in Open Space District 20, for Rancho Del Rey Development for the
perpetual maintenance of a desilting basin; and adopt the resolution establishing Zone 8 within Open
Space District No. 20, confirming the report, ordering the improvements and levying the first year
assessments at $0
BOARDS/COMMISSIONS RECOMMENDATION: Not applicable.
DISCUSSION:
Back!!round
Pursuant to Article 4, Chapter 1, Part 2 of Division 15 of the California Streets and Highways Code,
and the City of Chula Vista Municipal Code, the City Engineer has prepared and tiled this report.
The report includes a new zone for assessing properties, within Rancho del Rey development,
tributary to a newly constructed desilting basin located at the downstream end of the Bonita drainage
basin to pay fQr its maintenance and maintenance of an access road for hauling silt cleaned from the
basin. Establishing a zone for maintenance of the basin is consistent with Council Policy which
states that naturalized channel costs may be recovered through an open space district.
The heavy rains of the winter of 1992-1993 carried silt from the newly graded Rancho del Rey, Spa
II subdivision and deposited silt into the downstream pipes at Bonita Road and the Willow Street
bridge area. The builder and owner of the properties, Rancho del Rey Investors, agreed to construct
an access road as well as a desilting basin to forestall future problems. Pursuant to our policy,
McMillin Development Company is responsible for maintaining the basin for 5 years following
completion of the grading. Staff anticipates that the basin will be turned over for maintenance in July
1999. Subsequent to that date the City will maintain the basin using the funds collected through the
Open Space District 20, Zone 8.
/9-1
Page 2, ItemH
Meeting Date 7/26/94
Boundary
Staff proposes that a zone within Open Space District 20 be established to assess the properties
tributary to this desilting basin (See Figure 1).
Maintenance and Costs
The anticipated maintenance items are debris and silt removal from the desilting basin and
maintenance of the access road. This maintenance will be necessary to ensure that there will not be
excessive build-up of silt which would subsequently reduce the needed capacity of the basin and thus
could cause siltation downstream. The design engineer, Group Delta Consultants, estimated that the
basin can accumulate 428 cubic yards of sediment before cleaning is required (See Attachment B).
The design engineer has estimated that the annual sediment yield into the basin after the five year
maintenance period will be 200 cubic yards. This will allow for a two year cleaning interval. In
addition, the maintenance road will need to be regraded twice a year and replaced every 8 years.
The estimated cost of this maintenance is identified in Table I.
TABLE 1
ESTIMATE OF ANNUAL MAINTENANCE COSTS FOR OSD-20, ZONE 8
f!esCriptioilof l\faintenance Items.. (1) Cost AnnuaIizedCost
Regrade access road (twice a year) $500 $1,000
Replace access road (once every 8 years) $11 ,000 $1,375
Debris and silt removal (once every 2 years) $2,500 $1,250
Subtotal $14,000 $3,625
Total Yearly Assessment $3,625
1 Public Works --Or erations will be res onsible for thiS work
( )
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Methodolo~v
The methodology for spreading Zone 8' s cost is based on the amount of storm water runoff
anticipated for the various land uses on an acreage basis. Only those parcels which are tributary to
the desilting basin are proposed to be charged. Table 2 summarizes the factors used to determine
the spread which is consistent with the methodology used for Zone 1, East H Street desilting basin
within this district. The calculation is based on one (1) dwelling unit per acre (DUlAC) at $35.18
per year. Other yearly rates are multiples of the spread factor times the $35.18 per year assessment
(see Table 2). A typical assessment is $35.18. There are 546 parcels in the zone with spread factors
ranging from. 33 to 1 depending on the parcel density.
I''''~
Page 3, Item } 9
Meeting Date 7/26/94
TABLE 2
......
JJandIJse (l)11/AC1 ,
Single family detached 0-2 0.6 1.00 $35.18
2-4 0.6 0.33 11.62
4-6 0.6 0.20 N/A
8-10 0.6 0.14 N/A
Single family attached 10-12 0.7 0.10 N/A
12-20 0.7 0.D7
Multiple family attached 20+ 0.8 0.05 N/A
Employment park 0.9 1.50/ac N/A
Commercial 0.8 1.33/ac N/A
Church 0.7 1.17 lac N/A
The above assessments are based on the projected total annual assessment of $3,625.
Assessment
The proposed assessment for Zone 8, Fiscal Year 1994-1995 is $O/EDD as the developer must
maintain the basin for the first five years. The ultimate assessment is projected to be $35. 18 per
typical dwelling unit.
Notice
The public hearings have been noticed pursuant to Government Code 6063 which requires that notice
be published at least once a week for three weeks 10 days before the second public hearing.
Also pursuant to Section 54954.6 of the Government Code, property owners subject to an increased
assessment shall be notitied of the two hearings by mail 45 days in advance of the second public
hearing. All property within zone 8 is presently owned by Rancho del Rey Investors or one of their
guest builders. These owners within the open space zone were notified of the proposed
improvement, cost and both public hearings.
Staff is working with the developer to update the disclosure documents.
FISCAL IMPACT: The City recovers its costs from the open space assessments. Costs associated
with establishing the zone are covered by a deposit made by the developer.
JEF:OS-021
Attachments: Figure 1 - Zone 8
Figure 2 - Open space 20 map
Attachment A - aHcy
Attachme~ gmeer's estimate of annual silt yield
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RESOLUTION NO.
/753 ?
RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
CHULA VISTA ESTABLISHING ZONE 8 WITHIN OPEN
SPACE DISTRICT NO. 20, CONFIRMING THE REPORT,
ORDERING THE IMPROVEMENTS AND LEVYING THE
FIRST YEAR ASSESSMENTS AT $0 FOR FISCAL YEAR
1994/95
WHEREAS, a desilting basin was built by McMillin
Development in city open space off-site of Rancho del Rey land to
trap silt which washed down from the upstream development; and
WHEREAS, after maintenance by McMillin for 5 years, the
City will have to maintain the basin; and
WHEREAS, formation of Zone 8 within Open Space District
20 will provide financing for this maintenance; and
WHEREAS, Council has conducted a second public hearing on
July 26, 1994 to consider testimony on the establishment of Zone 8
in Open Space District 20 for Rancho Del Rey Development for the
perpetual maintenance of a desilting basin; and
WHEREAS, prior to the adoption of this resolution, the
city Council has caused the formation of various districts under
and pursuant to either the Chula vista Open Space District
Procedural Ordinance ("Procedural Ordinance"), as contained in
Chapter 17.07 (adopting in substantial part the 1972 Lighting and
Landscaping Act ("Act") as contained in Streets and Highways Code
section 22500, et seq., or pursuant to the Act itself designated as
follows:
Zone 8 within Open space District No. 20
WHEREAS, in accordance with the Procedural Ordinance, the
city Engineer has prepared a report on the spread of assessments
for said Open Space and Maintenance District ("Engineer's Report");
and
WHEREAS, the estimated cost of maintenance is identified
in Table 1:
1
/1-5
TABLE 1
ESTIMATE OF ANNUAL MAINTENANCE COSTS FOR OSD-20, ZONE 8
Regrade access road (twice a year)
Replace access road (once every 8
years)
silt removal (once every
Subtotal
$500
$11,000
$2,500
$14,000
Total Yearly Assessment
( ) Public Works - peratIons will be responsible
$1,000
$1,375
$1,250
$3,625
NOW, THEREFORE, BE IT RESOLVED that the City Council of
the City of Chula vista does hereby establish Zone 8 within Open
space District No. 20, confirming the report, ordering the
improvements and levying the first year assessments at $0 for
Fiscal Year 1994/95.
Presented by
John P. Lippitt, Director
of Public Works
C:\rs\zone8
2
/9-(,
"J
Bruce M. Booga
Attorney
COUNCIL AGENDA STATEMENT
ITEM TITLE:
Item I~
Meeting Date~
Public hearing to consider testimony on the establishment of Zone 8 in Open
Space District 20 for Rancho Del Rey Development for the perpetual
maintenance of a desilting basin
Director of Public W or~. qrI
City Manager~ ~ ~I
(4/Sths Vote: Yes_NoX)
SUBMIITED BY:
REVIEWED BY:
A desilting basin was built by McMillin Development in City open space off-site of Rancho del Rey
land to trap silt which washed down from the upstream development. After maintenance by
McMillin for 5 years, the City will have to maintain the basin. Formation of Zone 8 within Open
Space District 20 will provide fInancing for this maintenance.
RECOMMENDATION: That Council open and close the frrstpublic bearing to consider testimony
on the establishment of Zone 8 in Open Space District 20, for Rancho Del Rey Development for the
perpetual maintenance of a desilting basin. The second public hearing is scheduled for July 26,
1994.
BOARDS/COMMISSIONS RECOMMENDATION: Not applicable.
DISCUSSION:
Back2round
Pursuant to Article 4, Chapter 1, Part 2 of Division 15 of the California Streets and Highways Code,
and the City of Chula Vista Municipal Code, the City Engineer has prepared and f1led this report.
The report includes a new zone for assessing properties, within Rancho del Rey development,
tributary to a newly constructed desilting basin located at the downstream end of the Bonita drainage
basin to pay for its maintenance and maintenance of an access road for hauling silt cleaned from the
basin. Establishing a zone for maintenance of the basin is consistent with Council Policy which
states that naturalized channel costs may be recovered through an open space district.
The heavy rains of the winter of 1992-1993 carried silt from the newly graded Rancbo del Rey, Spa
II subdivision and deposited silt into the downstream pipes at Bonita Road and the Willow Street
bridge area. The builder and owner of the properties, Rancho del Rey Investors, agreed to construct
an access road as well as a desilting basin to forestall future problems. Pursuant to our policy,
McMillin Development Company is responsible for maintaining the basin for 5 years following
completion of the grading. Staff anticipates that the basin will be turned over for maintenance in July
1999. Subsequent to that date the City will maintain the basin using the funds collected through the
Open Space District 20, Zone 8.
~
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Bnunrlarv
Staff proposes that a zone within Open Space District 20 be established to assess the properties
tributary to this desilting basin (See Figure I). All property within this zone is presently owned by
Rancho Del Rey Investors or one of their guest builders.
M~int"n~nc.e and Cost~
The anticipated maintenance items are debris and silt removal from the desilting basin and
maintenance of the access road. This maintenance will be necessary to ensure that there will not be
excessive build-up of silt which would subsequently reduce the needed capacity of the basin and thus
could cause siltation downstream. The design engineer, Group Delta Consultants, estimated that the
basin can accumulate 428 cubic yards of sediment before cleaning is required (See Attachment B).
The design engineer has estimated that the annual sediment yield into the basin after the five year
maintenance period will be 200 cubic yards. This will allow for a two year cleaning interval. The
maintenance road will provide access from the south and is to be constructed of a 6 inch section of
decomposed granite. The road will need to be regraded twice a year and replaced every 8 years.
The estimated cost of this maintenance is indicated in Table I.
TABLE 1
ESTIMATE OF ANNUAL MAINTENANCE COSTS FOR OSD-20, ZONE 8
Subtotal
$500
$11,000
$2,500
$14,000
Annualized cost
$1,000
$1,375
$1,250
$3,625
J)eSerlptlOI1Of Maintenance ItelllS (1)
Regrade access road (twice a year)
Replace access road (once every 8 years)
Debris and silt removal (once every 2 years)
$3,625
Methodolol!v
The methodology for spreading Zone 8's cost is based on the amount of storm water runoff
anticipated for the various land uses on an acreage basis. Only those parcels which are tributary to
the desilting basin are proposed to be charged. Table 2 summarizes the factors used to determine
the spread which is consistent with the methodology used for Zone I, East H Street desilting basin
within this district. The calculation is based on one (1) dwelling unit per acre (DUlAC) at $35.18
per year. Other yearly rates are multiples of the spread factor times the $35.18 per year assessment
(see Table 2). A typical annual assessment is $35.18. There are 546 parcels in the zone with spread
factors ranging from .33 to I depending on the parcel density.
~
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Page 3, Item tK
Meeting Da~~
Multiple family attached
Employment park
Commercial
Church
TABLE 2
Density RUDoff
(DUlAC) Coeftlclent .use Ident
0-2 0.6 1.00 $35.18
2-4 0.6 0.33 11.62
4-6 0.6 0.20 N/A
8-10 0.6 0.14 N/A
10-12 0.7 0.10 N/A
12-20 0.7 0.07
20+ 0.8 0.05 N/A
0.9 1.50/ac N/A
0.8 1.33/ac N/A
0.7 1.171ac N/A
Single family detached
Single family attached
The above assessments are based on the projected total annual assessment of $3,625.
Assessment
The proposed assessment for Zone 8, Fiscal Year 1994-1995 is $O/EDU as the developer must
maintain the basin for the first five years. The ultimate assessment is projected to be $35.18 per
typical dwelling unit.
Notice
The public hearings have been noticed pursuant to Government Code 6063 which requires that notice
be published at least once a week for three weeks 10 days before the second public hearing.
Also pursuant to Section 54954.6 of the Government Code, property owners subject to an increased
assessment shall be notified of the two hearings by mail 45 days in advance of the second public
hearing. All property within Zone 8 is presently owned by Rancho del Rey Investors or one of their
guest builders. All owners within the proposed open space zone (Zone 8) were notified of the
proposed improvement and both public hearings.
FISCAL IMPACT: The City recovers its costs from the open space assessments. Costs associated
with establishing the zone are covered by a deposit made by the developer.
JEF:OS-021
Attachments:
Figure I - Zone 8
Figure 2 - Open space district 20 map
Attachment A - Council policy
Attachment B - Engineer'. estimate of lUIIlual silt yield
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RA.....CHO DEL REV OPEN 5 .~CE
MAINTENANCE DISTRICT NO. 20
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OOUNCL POUCY .r.,
mY OF aruLA VISl'A'.J
POUCY EFFECI1VE
NUMBER DAm
522-01 06-11-68
. I DATED: 06-11-68
PAGE
10F2
SUBJECI': DRAINAGE. STORM
ADOYn:~.u BY: Resolution No. 4786
a,&I'Yt:IIrwlNn
1he City CouIIdI bu ad0pte4 0rcIiaIn~ No. 1032, nIal:fDa tD Ihe c.IrOl fII draiaIp .... aDd watertOlll'Hl
and It " dMrefore _11'117 tD ..Wish. pollcJ tD lmplemeDt Aid ~-- aDd cany GUt Ira JIUI'POH and
IDIeDL
MtDDnl:II
IItIWW,U,1 . councI1 polley nIate4 tD Ibe .....,-lbllity aDd ............. fII draiaIp -- - Ihe criteria
lor Ibe des!p and COIIIlnICtlOll fIIllarm drUlqe facIlides.
POUCY
1be CouIIdI estab1iabes, bulull)', Ihe rouowiDa draiaIp poUcy:
1. DMim Criteria
In pneraJ, III major draiaIp cIwInelIlbaIJ be deslpecllll MeA.... . 50 ,.. ultimate Il'CIIID, without
ltadc heac!; lateral channels IbaIJ be _!peel to di-1uo"P . 10 JUI' IlDnD wIIbout Italic beac! .t
DlJ'InCU and I 50 year ultiIIIate __ utllizlnllftllable beac! without ausm, IUIlstantial damap tr
IIImlUIlCIinI property, and local cbannell IbaIJ be deslpecIlII 4...".... . 10 ,.. ItDnII utiIlzin..
avaI1able huc! without call1fnllllbstmtial pr oper1)' damqe, acept daat wbIft . IUIIIp CODclidOll alJtI
anc! acas lWIolf bu DO a1tm11te rwte, apeclaI desip aba11 be nquirecllor die protectlOll of
property.
2.. Gmera1 bmonsfbOirv lor CaMtrurtlDI'l Dr~" Padlities:
(
Ommuction R.emoftlibnlrv: Generallv. '" IlltedblrelD, tbe IIulc '>4 ra~~ lor dle IIIIIntmaDce
andlmprowment of cIralnqe facilltiet II dlat fII dle .....ptny 0WIIeI' tbrDuah __ propmythe IIItIII'Il
draiDqe cbannellWII and who nquInIlbe iIIIp.~t fII aa1c! fad\k$Iot lor dle protection fII bis
property ~dt. How_, dle City ... bave . pneraI nspOIlJibllity tD iIuure Ibe proper
CIIIIlI'UCtion, --- _ .............JtIIt fII draiDqe -- ID" l...cl dle public bealtb, aafet)'
8Dcl a-aJ MIfare fII dle City as . wbo1e. . . !
L MaiM Owmel,. . ._~ allllbllity .. dle e.t " dle desip .. ~ "die ~
_omIca1 "!p fII.., e"-l. and ID'UCtUnlIbaIJ .-1rith dle City. In dle -.m dlat Ibe
....,..rrtJ _ desire . .,-m .....~a., ..... .,.. IbID daat wIIJch " .........c! by Ibe
DincIDr fllPu!IUc Warb, dle71ba11 be.......1II eaqtriIIuIII dle ...._ ill dle e.t ~ estimated
., dle ~.cw "public Warb.. ;
III dle ,.. ., ... IlIWirilfoaa, dle ... .., nllllbD~ ... dle .. " .... _ .-ucdOIl fII
.., -1, and ID'UCtUnlIbaIJ be bome by dle IlIWI9kIer aduIlftlr ill ... calli wbIft dle
IUbcliYiIJoD CGmpriIIIllUIlstantial ponioD fIIdle draiaIp buiD .......
.
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l..:x:>UNCR. POUCY .) .
arY OF QIU1A VISTA
. EFfECI1VB
r""\JECl': DJWNAGE . STORM POUCY
. NUMBER DATE PAGE
522-01 06-11-68 20F2
AlX)YUIIJ BY: Resolution No. 4786 1 DATED: 06-11-68
.. ",teral o.annels. 'I'bt respoDIlbDity Ivr Ibe cost of desIp IIId ~ of IaUnl cIIIIIDe1s and
IIr\ICtIII'IS may be IMre4 equaI1y by Ibe City 1114 property 0WIlCI ......IftcL
..
c. 1_1 Oiannels. All -" IImI1wd ill desIp 1114 COIIIINCdoIl of local dIIIIDt1J allnlCt\lftS.
lDdu4inlllNClll* ill . ~ or IaUnl "".-1 ..maa . local .,.rem.1baU be IIarDe IIIIirel)' by
fI-opert)' 0WIlCI desIrlDIlbe az....v.- no". pnmde4, ......-. tbat Ibe City IIIIIJ panklp8N ill aald
-" ill in 1JD0llllt DOt III ~ fifty percent ~) If Ibe ,.nicu1c' lm)'lv-wDt _tiMes ·
fI'Oject e1is1ble for cooperadw ~."M"I u ousIlDe4 ill SecdoD 6 of Ibe Pollq Ivr ''''.,,~ IDtlded
"C;oc._.nve DniDale ProjecU".
I. e,tit'Y far 'inantlJ'lW various ~t'@mri... e' OraIM.e PrDlem:
'DIce .. aI:& bule categories of dnInaJe projecU dusUied accardinIlll Ibe I\IUIStecI meIbDcS of fiDaDdna.
11IeM catepria an4 Ibe fiDaDdna policy appUcable III _ch .. u follows:
L ,",0015 CcmIrOI Prolects. Tbe 1eclera1 .....omIent wualI)' ,.,. far .u -" acept dlht.ofoWl)',
nlocatlon 11115 nconstNCtIon of utDit\eI. 11IeM latter -" .. paid by Ibe City wi!h
,. n1mtNnement by Ibe SUte of California, DepI11IIlent of Water ___. PriorIty Ivr COIIItNCtIon
II determined by Ibe U.s. Arm)' CGrps of JnPeers.
b. 'uMivisioft ProIKts. When . ...~ Is suWMded, Ibe lUbdiVkler Is nquirec! III accept Ibe
I\IITO\IIIdinS dralnase u It mten bIJ ... Qr4tJ 11115 COIIW)' It ill .pproprIate (acDitlu across bIJ
fI'Opert)' to . lNitable ~e, which may IltCtSlltate Ibe acquisition of UHIIIentI and
consuuctlon of off..ite drainap (acUities. 'l'be COSt of Ibese projecU wDi be paid by Ibe lUbdirider.
c. Call1tallmllroftlllent Protects. 'l'beH an dnIDqe facIUrits which wDi benefit either Ibe eatIre . City
or . wry larIe community. ProjecU of dlis utme wDi be financed by Ibe City, either from Ibe
CapIW OIltIay 'IIIICI or from Gu Tax fuDds.
do Anesrment Protects. 1bne .. projeca wbkh IIIIIeIlt .my . local ~ a which ..
CIlIIIJU\lcteclllllCler Ibe 19111t1:t or 1911 N:t ku.,.v._4t proc....l"p. 'DIe ...- dIIIrict wDi
,.,..u -" IIId Ibe dIIIrict wDi iDdude IIIIJ Ibat fCOf~ wbich wDi IH I'" dlnct IIIM'It
L ---_ent ProIeCb with Cfty puticlllation. 1bne.. pn6KD wbkh, ill .dtir'CID III ....11'1..., ·
Ioca1 COIIIIIlllDity. a1Io lnc1ude work wbicb it of pIMI'81 beDIf1t III III atIIIIlft.... 'DIe _t of
City panldpatlon wDi be IJIIIDclIll tbat panton of Ibe IlI.r.Ject of pIMI'81 bIDeftt III Ibe City u ·
1Ibole 1114 UJIIIIl)' wDi DOt aCMC! so.. of Ibe IDcaI cost, I1Ibou1h 11M aacr azr"1lDt Ivr Iff'/ project
wDi ..y. cIependinI upaIllbe nIadw IIIIIeIlt a 11M ...paaslblllries ....mcL City -" wDi be
,.......... Irom Ibe ~ Ouda)' Pun4 or rna au Ta 6IDIIs .lfr.....1aIe.
f, r~tCDft Drain... ProIKu. A cac) .od... ...... pnjlct it _ III wbIcb 11M City IlbanlIbe
IDtIl COSt of Ibe iDIta1Iatlon wi!h Ibe ...L'''''lJ 1IWIItl'. Tbe per..-.tap of pu1ielp-tiM IbaU be
- Ilue4 upon IIIl1t1mate of dle ...r..d.... ~.. .1..4 by Ibe City 1114 Ibe ,n,ert)' owner
pepare4 by Ibe Db.c1Di' of Public w..albe Cir)"1 pu1i lpItl-1ha1I be ""'ltM III so.. of Ibe
.. IDtI1 COSt of Ibe mlllt ac_WI dIaIp. 0
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\ COUNCD.. POUCY -.j
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aTY OF aroIA VlSl'A
SUBJECl': DRAINAGE. NATURAL OIANGES WI1HIN POUCY EFFECI'IVB
OPEN SPACE NUMBER DATE PAGE
522-02 09-14-90 10F 1
IJ)OYI....J BY: Resolution No. 15869 I DATED: 09-14-90
u~nrlNn .
AI the IIlMtinJ " Ileptember 5, 1989, CouDdI a4opte4 0nIiDulce 2331 wbicb ....!..Id dle prouc!ures for
eIlab\llbfDa opeD lpace dlI1rictIlIl the Clty 11I4 ....mMd for dle -."'-...... "........ ~..I... III opeII lpace
..... Al1bouIh CouDdl adopted nbjlct ..II...."'" It dlncIecIllafr to I'IbIrD wish ..v.~IOI" to nqIIln the
MftIopen to ..ut III prII'IidlzIa ........, lor dle _."'--- el D8bn1 draiDIp ..,..
.--
.
EstabUsh . CoIIIlcD ;Olley wbIch -"''- the UlPDDllblUlies of dle .....oper nprdiDa IIIIIntallnCe "
DlNrIl dralnap WI)'I.
POUCY
'I1Ie CouDdI estIbUIbes the CoIlowlDl poIiey lor dle _."'--- "D8bn1 draiDIp ..,.:
1. When . deftloper nquatI formation of aD opeD lpace 6trict wbicb IDdIlda . D8bn1 dralnap
dwIIIeJ II pan of an opeIIlplce lot, the dftI10per IbaIl _.mr.m dle D8bn1 draiDIp facDitieI for ·
period of five JUn. 1be ftve JUI' IIIIIntenlDce period by the 4IeftIoper wllllIIIt wbtJI dle City CoImdI
aeceptI the opeII lpace landKapiDJ.
2- 1be IIlIintenlDCe IbaIl be pwllltetd throuIh . 1IcmcI to the City In an IIIlOlIJU aqua) to the estimated
five.year COlt. AI the nqum of the cltvtIoper. the Clty 11II)' allow dle boDeI to be nducecllDtIlIIII)' by
10.. per year anel reltutc1 c.DP1ttel)' after five JUn. '
;
3. 'l'bt district IbaIl be formtcIlII4 - _.. lifted duriDI the tift year perlocI wblie the.fuIl COlt el
lIlIIntenance of the cbIrmeI .. btInI tlam ~ dle *'-loper. 1blI ...v.lttr . --... IIDOIIZ1t to be
1IIiUzeellll _ of _erpncy.
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..':.\. \Ic\tillin fUOln1Unities
April 22. 1993
City or Cbula Vista
Department of Public Works
Engineering Division
276 Fourth Avenue
Quia Vista. California 91910
Attention: Ms. Donna Snider
Regarding: Rancho Del Rey Open Space District No. 20
Cost Estimate for Maintenance of Gabion Retention Basin
Dear Donna:
In response to your letter of March 23. 1993. ....e present the
following estimate of the cost to maintain the retention basin ....hich
bas just been constructed downstream of Rancho Del Rey SPA II. The
basin is to be maintained by funds from District No. 20 after an
initial maintenance period by us. This estimate assumes that Rancho
Del Rey ....ill maintain the basin for the nnt five years.
approximately. during ....hich the residential .ubdivisions upstream
'Will be completed.
The design engineer. Group Delta Consultants. has estimated that 428
cubic yards of sediment can be deposited in the retention basin
before it ....ill require deanina. They bave estimated the sediment
yield in the drainage basin. at the time 'When the District ....ould begin
. .
maintenance. to be about 200 cubic yardS per year. Therefore they
estimate that the basin 'Would need to be deaned every other year.
In a1ddition to cleaninl the basin. "We assume that lome minot
maintenance to the access road "Would be required 10 that trucks
could haul the .ediment out. The access road also is an equestrian
trail and 'Will receive lome level or maintenance because or that.
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Given the above. our estimate is as follows:
428 c.y. (use '00 c.y.) Z SS.OO/c.y.-
Grade aceess road as required -
SS.000/2 year m~~ru,l.-...
,
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$2.'00 .
$2.000 tV",
------
$4.'00 use ".000
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We bope this estimate belps you in establisbina tbe lone. . Please call
me at 477-4170. extension 443. sbould you require additional
information.
Very Truly Your~~~
c?!~Jtj}~- -
Rancho Del Rey Partnership
Tbom Fuller
Vice President. McMillin Communities
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